const express = require('express');
const path = require('path');
const fs = require('fs');
const bodyParser = require('body-parser');
const history = require('connect-history-api-fallback');

const app = express();
const PORT = process.env.PORT || 3000;

app.use(bodyParser.json());

// 读取文件内容
app.get('/api/getData', (req, res) => {
  const filePath = process.env.CURRENT_LEVEL_PATH;
  if (!filePath) {
    return res.status(400).json({ error: '环境变量 CURRENT_LEVEL_PATH 未设置' });
  }

  try {
    const absPath = path.resolve(filePath);
    if (!fs.existsSync(absPath)) {
      return res.status(404).json({ error: `文件不存在: ${absPath}` });
    }
    const content = fs.readFileSync(absPath, 'utf-8');
    res.json({
      path: absPath,
      content
    });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// 更新文件内容
app.post('/api/putData', (req, res) => {
  const filePath = process.env.CURRENT_LEVEL_PATH;
  if (!filePath) {
    return res.status(400).json({ error: '环境变量 CURRENT_LEVEL_PATH 未设置' });
  }

  let { content } = req.body;
  if (content === undefined) {
    return res.status(400).json({ error: '缺少 content 参数' });
  }

  try {
    const absPath = path.resolve(filePath);
    fs.writeFileSync(absPath, content, 'utf-8');
    res.json({
      message: '文件已更新',
      path: absPath
    });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// 当前目录作为静态目录
app.use(history());
app.use(express.static(process.cwd()));

app.listen(PORT, () => {
  console.log(`Server running at http://localhost:${PORT}`);
});